#include "sys.h"
#include "usart.h"	  
#include "FreeRTOS.h"

#pragma import(__use_no_semihosting)             
             
struct __FILE 
{ 
	int handle;
}; 

FILE __stdout;       

void _sys_exit(int x) 
{ 
	x = x; 
} 

int fputc(int ch, FILE *f)
{      
	while((USART1->SR&0X40)==0);
		USART1->DR = (u8)ch;
	return ch;
}

u8 USART_RX_BUF[USART_REC_LEN];
u16 USART_RX_STA=0;
  
void uart_init(u32 bound)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);

	USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

	USART_Init(USART1, &USART_InitStructure);
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	USART_Cmd(USART1, ENABLE);
}

void USART1_IRQHandler(void)
{
	u8 Res;

	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
	{
		Res = USART_ReceiveData(USART1);
		
		if((USART_RX_STA&0x8000)==0)
			{
			if(USART_RX_STA&0x4000)
			{
				if(Res!=0x0a)
					USART_RX_STA = 0;
				else
					USART_RX_STA |= 0x8000;
			}
			else
			{	
				if(Res == 0x0d)
					USART_RX_STA |= 0x4000;
				else
				{
					USART_RX_BUF[USART_RX_STA & 0X3FFF] = Res;
					USART_RX_STA++;
					if(USART_RX_STA>(USART_REC_LEN - 1))USART_RX_STA = 0;
				}		 
			}
		}   		 
	} 
}

